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[FFmpeg-devel,07/39] avcodec/rl: Allow to create only a few VLC tables

Message ID 20201210111657.2276739-8-andreas.rheinhardt@gmail.com
State Accepted
Commit 8f04988e463f17d58ba5a52f09cf49231037bb6c
Headers show
Series Make mpegvideo encoders init-threadsafe
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Commit Message

Andreas Rheinhardt Dec. 10, 2020, 11:16 a.m. UTC
It is not uncommon that only the first one is used; this is similar to
ff_init_2d_vlc_rl().

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
---
 libavcodec/rl.c | 3 +++
 libavcodec/rl.h | 8 ++++++++
 2 files changed, 11 insertions(+)

Comments

Andreas Rheinhardt Jan. 23, 2021, 10:08 p.m. UTC | #1
Andreas Rheinhardt:
> It is not uncommon that only the first one is used; this is similar to
> ff_init_2d_vlc_rl().
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
> ---
>  libavcodec/rl.c | 3 +++
>  libavcodec/rl.h | 8 ++++++++
>  2 files changed, 11 insertions(+)
> 
> diff --git a/libavcodec/rl.c b/libavcodec/rl.c
> index c532b5bf56..93153ff723 100644
> --- a/libavcodec/rl.c
> +++ b/libavcodec/rl.c
> @@ -80,6 +80,9 @@ av_cold void ff_rl_init_vlc(RLTable *rl, unsigned static_size)
>          int qmul = q * 2;
>          int qadd = (q - 1) | 1;
>  
> +        if (!rl->rl_vlc[q])
> +            return;
> +
>          if (q == 0) {
>              qmul = 1;
>              qadd = 0;
> diff --git a/libavcodec/rl.h b/libavcodec/rl.h
> index a83debccf7..26e0b32a90 100644
> --- a/libavcodec/rl.h
> +++ b/libavcodec/rl.h
> @@ -68,6 +68,14 @@ void ff_rl_init_vlc(RLTable *rl, unsigned static_size);
>      }\
>  }
>  
> +#define INIT_FIRST_VLC_RL(rl, static_size)              \
> +do {                                                    \
> +    static RL_VLC_ELEM rl_vlc_table[static_size];       \
> +                                                        \
> +    rl.rl_vlc[0] = rl_vlc_table;                        \
> +    ff_rl_init_vlc(&rl, static_size);                   \
> +} while (0)
> +
>  static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
>  {
>      int index;
> 
Will apply all the patches up until #26 tomorrow unless there are
objections.

- Andreas
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Patch

diff --git a/libavcodec/rl.c b/libavcodec/rl.c
index c532b5bf56..93153ff723 100644
--- a/libavcodec/rl.c
+++ b/libavcodec/rl.c
@@ -80,6 +80,9 @@  av_cold void ff_rl_init_vlc(RLTable *rl, unsigned static_size)
         int qmul = q * 2;
         int qadd = (q - 1) | 1;
 
+        if (!rl->rl_vlc[q])
+            return;
+
         if (q == 0) {
             qmul = 1;
             qadd = 0;
diff --git a/libavcodec/rl.h b/libavcodec/rl.h
index a83debccf7..26e0b32a90 100644
--- a/libavcodec/rl.h
+++ b/libavcodec/rl.h
@@ -68,6 +68,14 @@  void ff_rl_init_vlc(RLTable *rl, unsigned static_size);
     }\
 }
 
+#define INIT_FIRST_VLC_RL(rl, static_size)              \
+do {                                                    \
+    static RL_VLC_ELEM rl_vlc_table[static_size];       \
+                                                        \
+    rl.rl_vlc[0] = rl_vlc_table;                        \
+    ff_rl_init_vlc(&rl, static_size);                   \
+} while (0)
+
 static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
 {
     int index;